Electrostatic electroacoustic transducer device, signal processing circuit for electrostatic electroacoustic transducer, signal processing method, and signal processing

Abstract

The present invention is a signal processing circuit 12 for an electrostatic electroacoustic transducer configured to correct signals input to a single driven electrostatic electroacoustic transducer 15 including a diaphragm 151 and a fixed electrode 152 disposed to face the diaphragm. The signal processing circuit includes a correction value determiner 122 configured to determine a correction value v 1 of a level based on a level of the input signals s 1 from the sound source, and a level corrector 124 configured to correct the level of the input signals based on the correction value. The level corrector is configured to correct the level of an input signal among the input signals based on the correction value. The input signal corresponds to a signal for displacing the diaphragm to a first direction side on which a fixed electrode is not disposed with respect to a predetermined position.

The invention claimed is: 
     
       1. A signal processing circuit for an electrostatic electroacoustic transducer configured to correct signals input to a single driven electrostatic electroacoustic transducer including a diaphragm and a fixed electrode disposed to face the diaphragm, the signal processing circuit comprising:
 a correction value determiner configured to determine a correction value based on a level of an input signal from a sound source; and 
 a level corrector configured to correct the level of the input signal based on the correction value, wherein 
 the level corrector is configured to correct the level of the input signal displacing the diaphragm to a first direction side on which the fixed electrode is not disposed with respect to a predetermined position, among the signals based on the correction value. 
 
     
     
       2. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 1 , wherein the level corrector is configured to increase the level. 
     
     
       3. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 1 , wherein the correction value is a value for displacing the diaphragm by a required amount of displacement in the first direction. 
     
     
       4. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 1 , further comprising:
 a level detector configured to correct the level of the input signal, wherein 
 the correction value determiner is configured to determine the correction value based on the level detected by the level detector. 
 
     
     
       5. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 4 , further comprising:
 a storage configured to store a plurality of parameters corresponding to a plurality of levels of the signals, wherein 
 the correction value determiner is configured to select a parameter from the plurality of parameters based on the level detected by the level detector and to output the selected parameter as the correction value to the level corrector. 
 
     
     
       6. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 5 , wherein the storage is configured to store one of the parameters corresponding to each range of the level. 
     
     
       7. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 5 , wherein
 the storage is configured to store parameter groups composed of a plurality of parameters, 
 the parameter groups include a first parameter group and a second parameter group, and 
 a plurality of parameters constituting the first parameter group are different from a plurality of parameters constituting the second parameter group. 
 
     
     
       8. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 4 , wherein the correction value determiner is configured to calculate the correction value based on the level detected by the level detector. 
     
     
       9. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 8 , further comprising:
 a storage configured to store a calculation function determined in accordance with the electrostatic electroacoustic transducer, wherein 
 the correction value determiner is configured to calculate the correction value based on the calculation function. 
 
     
     
       10. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 9 , wherein
 the calculation function is a polynomial approximating a measured value of the correction value, and 
 the correction value determiner is configured to calculate the correction value using the polynomial. 
 
     
     
       11. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 9 , wherein the storage is configured to store a plurality of calculation functions corresponding to an amount for correcting the level. 
     
     
       12. The signal processing circuit for the electrostatic electroacoustic transducer according to  claim 1 , wherein the level corrector is configured to correct a non-linearity of the level. 
     
     
       13. An electrostatic electroacoustic transducer device, comprising:
 a single driven electrostatic electroacoustic transducer including a diaphragm and a fixed electrode disposed to face the diaphragm; and 
 a signal processing circuit configured to correct signals input to the electrostatic electroacoustic transducer, wherein 
 the signal processing circuit is a signal processing circuit for the electrostatic electroacoustic transducer of  claim 1 . 
 
     
     
       14. A signal processing method executed by a signal processing circuit configured to correct signals input to a single driven electrostatic electroacoustic transducer comprising a diaphragm and a fixed electrode disposed to face the diaphragm, the signal processing method including:
 determining a correction value based on a level of an input signal from a sound source; and 
 correcting the level of the input signal based on the correction value, wherein 
 correcting corrects the level of the input signal displacing the diaphragm to a first direction side on which the fixed electrode is not disposed with respect to a predetermined position, among the signals.